BOILER HEAT TRANSFER PIPE AND BOILER

• Main Authors: TOYOMARU MAKOTO, SHIRANE TAKAHIRO, KOMAI NOBUYOSHI
• Format: Patent
• Language: English
• Published: 29.07.2010
• Subjects: BLASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION; DIFFUSION TREATMENT OF METALLIC MATERIAL; HEAT EXCHANGE IN GENERAL; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; METHODS OF STEAM GENERATION; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; STEAM BOILERS; STEAM GENERATION; WEAPONS

PROBLEM TO BE SOLVED: To provide a boiler heat transfer pipe and a boiler for preventing fracture of a heat transfer pipe. SOLUTION: This boiler includes the boiler heat transfer pipe 10 in which fluid flows and which is composed of steel including at least Cr, and a surface-treated layer formed by performing cold-working on an inner surface of the boiler heat transfer pipe 10, and degrees of treatment on the surface-treated layer at each of sections 11A, 11B, 11C, 11D, 12A, 12B, 12C, 12D of the inner surface are different from each other. COPYRIGHT: (C)2010,JPO&INPIT